A simple way to determine if a String could be an integer

There are a lot of ways to check if a String could represent an integer value. I will show you two very simple and yet fast methods:

Method 1

    public final static boolean isInteger(String in)
    {
        char c;
        int length = in.length();
        boolean ret = length > 0;
        int i = ret && in.charAt(0) == '-' ? 1 : 0;
        for (; ret && i < length; i++)
        {
            c = in.charAt(i);
            ret = (c >= '0' && c <= '9');
        }
        return ret;
    }

Method 2 (modified version of method 1)

    public static boolean isInteger(String in)
    {
        if (in != null)
        {
            char c;
            int i = 0;
            int l = in.length();
            if (l > 0 && in.charAt(0) == '-')
            {
                i = 1;
            }
            if (l > i)
            {
                for (; i < l; i++)
                {
                    c = in.charAt(i);
                    if (c < '0' || c > '9')
                        return false;
                }
                return true;
            }
        }
        return false;
    }

Method 3 

    static final byte[] b = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

    public final static boolean isInteger(String in)
    {
        char c;
        int length = in.length();
        int i = 0;
        if (length > 0 && in.charAt(0) == '-')
            i = 1;
        if (i >= length)
        {
            return false;
        }
        for (; i < length; i++)
        {
            c = in.charAt(i);
            if (b[c & 0xff] == 0)
                return false;
        }
        return true;
    }


I hope this information is useful.

PS. Be aware that all of these will say that very large strings (with valid big integers) are true, so if you just try to convert them to Integers, an Exception could be thrown.

Multiple column list using HTML (ul and li)

I know that you could find a lot of ways to show columns using HTML,  but sometimes for most of those ways you need a "deep"  knowledge of CSS, if you just know the very basic stuff of CSS and HTML, then this is for you. Fast and easy.

The idea is having a multicolumn list, using ul and li tags (and just a little bit of CSS).
Let's suppose you have the following data and you want them to show as a column for every category:

id  name         category
--------------------------
1   Antena       Exterior
2   Emblema      Exterior
3   Llantas      Exterior
4   Luces        Exterior
5   Estéreo      Interior
6   Tapetes      Interior
7   Encendedor   Interior
8   Gato         Accesorio
9   Extintor     Accesorio
10  Herramientas Accesorio
11  Claxon       Cofre
12  Batería      Cofre
13  Filtro aire  Cofre


You want them to look like this:

Exterior   Interior    Accesorio     Cofre
---------  ----------  ------------  -----------
Antena     Estéreo     Gato          Claxon
Emblema    Tapetes     Extintor      Batería
Llantas    Encendedor  Herramientas  Filtro aire
Luces

So, the HTML code could be as easy as this:

<ul style="float:left;list-style-type: none;">Exterior<hr>
    <li>Antena</li>
    <li>Emblema</li>
    <li>Llantas</li>
    <li>Luces</li>
</ul>

<ul style="float:left;list-style-type: none;">Interior<hr>
    <li>Estéreo</li>
    <li>Tapetes</li>
    <li>Encendedor</li>
</ul>

<ul style="float:left;list-style-type: none;">Accesorio<hr>
    <li>Gato</li>
    <li>Extintor</li>
    <li>Herramientas</li>
</ul>

<ul style="float:left;list-style-type: none;">Cofre<hr>
    <li>Claxon</li>
    <li>Batería</li>
    <li>Filtro aire</li>
</ul>



There you have It!.

I hope this is useful for you.

Signing Qt5 (5.2.0) Applications in Mac OSX Mavericks

I was trying to sign an application that We developed with Qt5 (medicalmanik.com) and due to the not so clear documentation you find out there, I decided to publish the way I could complete this task (I tried some procedures I found on different sites without success -that's why I am publishing this).

First of all let me tell you that I just basically modified one script I found on Internet (and use another one as is) and adapted it to my needs, so you just have to edit some lines in It and that's it!

What It is important to notice is that if you want to distribute your application out of the AppStore you will need a Developer ID Application certificate (not the Mac Developer -this is just for testing).

OK, let's begin...

1) Copy, paste and save to a file the following code, or download it  from  https://gist.github.com/kainjow/8059407 (macdeployqt_fix_frameworks.rb). There is not need to modify it.


#!/usr/bin/env ruby

# Copies missing Info.plist files for a .app's Qt frameworks installed
# from macdeployqt. Without the plists, 'codesign' fails on 10.9 with
# "bundle format unrecognized, invalid, or unsuitable".
#
# Example usage: 
# ruby macdeployqt_fix_frameworks.rb /Users/me/Qt5.2.0/5.2.0/clang_64/ MyProgram.app
#
# Links:
# https://bugreports.qt-project.org/browse/QTBUG-23268
# http://stackoverflow.com/questions/19637131/sign-a-framework-for-osx-10-9
# http://qt-project.org/forums/viewthread/35312

require 'fileutils'

qtdir = ARGV.shift
dotapp = ARGV.shift

abort "Missing args." if !qtdir || !dotapp
abort "\"#{qtdir}\" invalid" if !File.exists?(qtdir) || !File.directory?(qtdir)
abort "\"#{dotapp}\" invalid" if !File.exists?(dotapp) || !File.directory?(dotapp)

frameworksDir = File.join(dotapp, 'Contents', 'Frameworks')
Dir.foreach(frameworksDir) do |framework|
  next if !framework.match(/^Qt.*.framework$/)
  fullPath = File.join(frameworksDir, framework)
  destPlist = File.join(fullPath, 'Resources', 'Info.plist')
  next if File.exists?(destPlist)
  srcPlist = File.join(qtdir, 'lib', framework, 'Contents', 'Info.plist')
  abort "Source plist not found: \"#{srcPlist}\"" if !File.exists?(srcPlist)
  FileUtils.cp(srcPlist, destPlist)
end

2) Create a file named macdeployqt.sh (this will call macdeployqt_fix_frameworks.rb and macdeployqt ) and copy, paste and edit the following code (posted by Sarah Jane Smith on https://bugreports.qt-project.org/browse/QTBUG-23268). Modify It according to your needs (take a look at the PATHS).


# Create a temporary copy of the app for deploy & signing
# This must not be previously signed/sandboxed
# Include the .app suffix

APP_NAME=$1

QT5_CLANG=/Users/hectorsuarez/Aplicaciones/Qt5.2.0/5.2.0/clang_64
QT5_BIN=$QT5_CLANG/bin


#EXT_SIGN_CERT="Mac Developer: Hector Suarez Barenca"
EXT_SIGN_CERT="Developer ID Application: Barenca Networks"

# This will create a temporary directory
BUILD_TMP=~/tmp
if [ -d $BUID_TMP ]
then
echo
echo "###"
echo "### Cleaning directory... $BUILD_TMP/$APP_NAME ###"
echo "###"
echo
### Borrar versión previa
rm -rf $BUILD_TMP/$APP_NAME
else
    mkdir -p $BUILD_TMP
fi

echo "### Copy $APP_NAME to $BUILD_TMP"
echo

### Copy the .app to a temporary location
cp -R $APP_NAME $BUILD_TMP

TMP_APP=$BUILD_TMP/$APP_NAME

QT_FMWK_VERSION="5"
QT_FMWKS="QtCore QtGui QtPrintSupport QtWidgets QtMultimedia QtMultimediaWidgets QtNetwork QtSql QtScript QtWebKitWidgets QtOpenGL QtPositioning QtQml QtQuick QtSensors QtWebKit"

echo "### Deploying Qt ${QT_FMWK_VERSION}..."
echo 
$QT5_BIN/macdeployqt $TMP_APP $VERBOSE_MACDEPLOY_QT

echo "Patching Qt frameworks..."

## Set the right PATH 
~/Aplicaciones/macdeployqt_fix_frameworks.rb $QT5_CLANG $TMP_APP

for FMWK in $QT_FMWKS; do
    FMWK_PATH="${TMP_APP}/Contents/Frameworks/${FMWK}.framework"
    mv -v "${FMWK_PATH}/Resources" "${FMWK_PATH}/Versions/${QT_FMWK_VERSION}/."
    (cd "${FMWK_PATH}" && ln -s "Versions/${QT_FMWK_VERSION}/Resources" "Resources")
    (cd "${FMWK_PATH}/Versions" && ln -s "${QT_FMWK_VERSION}" "Current")
    perl -pi -e "s/${FMWK}_debug/${FMWK}/" "${FMWK_PATH}/Resources/Info.plist"
done


echo "Codesigning..."
for FMWK in $QT_FMWKS; do
    FMWK_PATH="${TMP_APP}/Contents/Frameworks/${FMWK}.framework"
    /usr/bin/codesign --verbose \
        --sign "$EXT_SIGN_CERT" \
        "${FMWK_PATH}/Versions/5"
done

for PLGN in $(find $TMP_APP -name "*.dylib"); do
    /usr/bin/codesign --verbose \
        --sign "$EXT_SIGN_CERT" \
        ${PLGN}
done

echo
echo "### Trying to sign $APP_NAME"
echo
/usr/bin/codesign --verify --verbose \
    --sign "$EXT_SIGN_CERT" \
    $TMP_APP

echo ""
echo "### Confirming \"Registered Developer\" codesiging of app"
codesign --verify --verbose=4 $TMP_APP

echo ""
echo "### Confirming codesigning app, frameworks & plugins for GateKeeper"
spctl --verbose=4 --assess --type execute $TMP_APP

3) Execute macdeployqt.sh  and enjoy It!



I hope this works for you.  Best regards.


PS. I tested these scripts with Qt 5.2.0
      Thanks to those that take time to help others


References:
https://gist.github.com/kainjow/8059407
https://bugreports.qt-project.org/browse/QTBUG-23268

https://developer.apple.com/library/mac/documentation/IDEs/Conceptual/AppDistributionGuide/DistributingApplicationsOutside/DistributingApplicationsOutside.html

http://stackoverflow.com/questions/19637131/sign-a-framework-for-osx-10-9

http://stackoverflow.com/questions/7697508/how-do-you-codesign-framework-bundles-for-the-mac-app-store

http://www.copyquery.com/productsigned-mac-app-not-installing-in-computers-that-are-not-mine/

How to remove iPhoto faces with a shell script

Now I will show you a very simple (but yet effective) way to remove the iPhoto faces with a shell script (It seems that iPhoto does not have an option to disable this feature -that's ridiculous!).

1) Open a Terminal (cmd space and then type Terminal )
2) Type vi  and then press i
3) Copy and paste the following code:

#!/bin/bash 
mdfind 'kMDItemDisplayName == "IMG_*face*.jpg"'|awk '{print "rm -f \""$0"\""}'>rmfaces 
chmod 755 rmfaces
./rmfaces 
rm rmfaces 
echo "It's done!"

4) Press  and then type :x , choose the filename (byefaces) and hit
5) Once you are in the terminal prompt again, type 

    chmod 755 byfaces 

5) That's all!!!! 
6) Now execute it and It's done! 

    ./byfaces 


This works for me. Please let me know if It works for you. 

Ps. This will erase the files that were created by iPhoto but iPhoto will continue creating face files, so execute the script as you need it.

List to Tree (using whitespaces to indent) with Groovy

Supose you have a structure like this:

id	name	father
1	N1	null
11	N11	1
12	N12	1
121	N121	12
122	N122	12
13	N13	1
131	N131	13
1311	N1311	131
13111	N13111	1311
14	N14	1
2	N2	null

public class Node {
    def id
    def name
    def father
}

public class NodePrinter {
    private void printLeftPad(def source,int pad)
    {
        for(int i=0;i<pad;i++) print " ";
        println source;
    }
    
    public int indent(List items,int index,int pad)
    {
        printLeftPad("${items.get(index).name}",pad);

        def current= items.get(index);
        int i=index+1;
        for(;i<items.size();i++)
        {
            if( items.get(i).father==current.id )
            {
                printLeftPad("{",pad);
                i=indent(items,i,pad+4);
                printLeftPad("}",pad);
            }
            else
            {
                if( current.father==items.get(i).father )
                {
                    printLeftPad("${items.get(i).name}",pad);
                    current=items.get(i);
                }
                else
                {
                    return i-1;
                }
            }
        }

        return i;
    }

}

def nodes=[ new Node(id:1,name:'N1',father:null),
            new Node(id:11,name:'N11',father:1),
            new Node(id:12,name:'N12',father:1),
            new Node(id:121,name:'N121',father:12),
            new Node(id:122,name:'N122',father:12),
            new Node(id:13,name:'N13',father:1),
            new Node(id:131,name:'N131',father:13),
            new Node(id:1311,name:'N1311',father:131),
            new Node(id:13111,name:'N13111',father:1311),
            new Node(id:14,name:'N14',father:1),
            new Node(id:2,name:'N2',father:null)
          ];
          
def printer=new NodePrinter();
printer.indent(nodes,0,4);

This will give us the following result:

    N1
    {
        N11
        N12
        {
            N121
            N122
        }
        N13
        {
            N131
            {
                N1311
                {
                    N13111
                }
            }
        }
        N14
    }
    N2

Enjoy it!

Source code formatter library for Java

Recently I was looking for a Java Library that could be include in an applet (with no any dependencies), after looking for awhile I could not find any library (there are a few out there but all of them have dependencies with other libraries). 

I found a C++ program named Artistic Style (http://astyle.sourceforge.net/) , so I decided to migrate the source code from C++ to Java, and the jastyle project arises (http://sourceforge.net/projects/jastyle/).

There are two ways in which jastyle could be used, as a library or as a console application. See how easy is to format Java source code with jastyle.

First, go to (http://sourceforge.net/projects/jastyle/) and download the lastest jastyle.jar , then choose the Java source file that you want to give format. The options will be shown if you just type:

java -jar jastyle.jar 

Now let's see how It works with an unformatted java source code:

package net.barenca.test;

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.util.Date;
import java.util.Random;

import oracle.jdbc.OracleDriver;

public class OracleBlobTest{
public static void main(String[] args) throws Exception
{
String filename="/home/barenca/Documents/LDAP.pdf";
FileInputStream fis = new FileInputStream(filename);
BufferedInputStream inputStream = new BufferedInputStream(fis);

  int length = inputStream.available();
  DriverManager.registerDriver(new OracleDriver());
String url="jdbc:oracle:thin:@192.168.1.253:1521:devdb";
  Connection conn = DriverManager.getConnection(url
          , "prueba",
          "prueba");
  String insert = "insert into test_blob(id,content)values(?,?)";

PreparedStatement pst = conn.prepareStatement(insert);
int x = new Random(new Date().getTime()).nextInt(100000);

pst.setInt(1, x);
pst.setBinaryStream(2, inputStream, length);
pst.execute();
pst.close();

  conn.close();
  inputStream.close();
}}

And after java -jar jastyle.jar --style=java OracleBlobTest.java this is the result:

package net.barenca.test;
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.util.Date;
import java.util.Random;
import oracle.jdbc.OracleDriver;
public class OracleBlobTest {
public static void main(String[] args) throws Exception {
       String filename ="/home/barenca/Documents/LDAP.pdf";
       FileInputStream fis = new FileInputStream(filename);
       BufferedInputStream inputStream = new BufferedInputStream(fis);
       int length = inputStream.available();
       DriverManager.registerDriver(new OracleDriver());
       String url ="jdbc:oracle:thin:@192.168.1.253:1521:devdb";
       Connection conn = DriverManager.getConnection(url
                         , "prueba","prueba");
       String insert = "insert into test_blob(id,content)values(?,?)";
       PreparedStatement pst = conn.prepareStatement(insert);
       int x = new Random(new Date().getTime()).nextInt(100000);
       pst.setInt(1, x);
       pst.setBinaryStream(2, inputStream, length);
       pst.execute();
       pst.close();
       conn.close();
       inputStream.close();
   }
}

I think is not perfect, but It helps a lot :) .

Now, as a library :

import java.io.Reader;
import java.io.FileReader;
import java.io.BufferedReader;
import net.barenca.jastyle.ASFormatter;
import net.barenca.jastyle.FormatterHelper;

public static void main(String[] args) throws Exception
{

 ASFormatter formatter = new ASFormatter();
 formatter.setJavaStyle();
 Reader in = new BufferedReader(new FileReader("OracleBlobTest.java"));

 String formatted = FormatterHelper.format(in,formatter);

 // and that's it!
}

The best thing is that this library does not need any additional jar library!!!.

I hope you enjoy it!.

Best regards.

Héctor.

Mapping Windows Key (Super) in Ubuntu

Probably one of the functions that a Windows user is accustom to is the mapping of the Windows key + E (this opens the Explorer -not the Internet Explorer), this combination of key mapping is not enabled by default in Ubuntu (I have tested it in Ubuntu 9.04, XUbuntu 8.10 and 9.04).

So, let me show you how easy is to map the windows key + E in order to have the same behavior in Ubuntu as Windows does it.

First go to option menu System -->Preferences-->Keyboard and then choose the tab "Layouts" and then "Layout options", and go to the Alt/Win key behavior subtree, open it and click on the radio button Supper key is mapped to Win keys and then click on close (or accept) and click on the another close button.

Second, go to System --> Preferences --> Keyboard Shortcuts and look for the Desktop section and click on the Home folder row, now press at the same time the two keys Windows + E (like in Windows - plus symbol should not be pressed), once you have done it, the combination of keys (the shortcut) to open Nautilus is ready!, accept the change.

Now continue mapping the keys you are accustom to. I hope this short description is useful for you.

Best regards.